Flatten out the bag. cut off the bottom and the handles. Open up the bag and begin cutting a spiral strip about 1-1/2" wide, turning the bag as you go. Keep cutting until you have one long strip. Tie the ends of the strips together, cutting off the excess.Start rolling the strips into a ball. Continue tying strips together until you have 20 or 30 bags cut up. This can be time consuming but I like to cut the bags up while I'm watching TV and, before I know it, I've got a couple dozen bags cut up and rolled into a ball.